Glucose testing instrument



FIG. 1 is a top, front, left side perspective view of a glucose testing instrument, showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view, with the right side elevational view being a mirror image thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a glucose testing instrument, as shown and described. 